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chromium toxicity

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https://www.readbyqxmd.com/read/28532904/cr-in-dredged-marine-sediments-anthropogenic-enrichment-bioavailability-and-potential-adverse-effects
#1
Fabienne Baraud, Lydia Leleyter, Mélanie Lemoine, Hakim Hamdoun
This study focuses on chromium detected in 13 harbor sediments dredged across the English Channel. The total concentrations of Cr range from 5 to 61mgkg(-1), which reveal no or low enrichment for 12 of the 13 samples, according the enrichment factor (EF) calculations. Sequential extraction procedure was applied to determine the mineralogical speciation of Cr, in order to assess its potential (re)mobilization to the aquatic environment. Cr is mainly associated to the residual fraction, then distributed in the oxydizable and reducible fractions...
May 19, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28531658/co-plantation-of-aquatic-macrophytes-typha-angustifolia-and-paspalum-scrobiculatum-for-effective-treatment-of-textile-industry-effluent
#2
Vishal V Chandanshive, Niraj R Rane, Asif S Tamboli, Avinash R Gholave, Rahul V Khandare, Sanjay P Govindwar
Field treatment of textile industry effluent was carried out in constructed drenches (91.4m×1.2m×0.6m; 65.8m(3)) planted independently with Typha angustifolia, Paspalum scrobiculatum and their co-plantation (consortium-TP). The in situ treatment of effluent by T. angustifolia, P. scrobiculatum and consortium-TP was found to decrease ADMI color value by 62, 59 and 76%, COD by 65, 63 and 70%, BOD by 68, 63 and 75%, TDS by 45, 39 and 57%, and TSS by 35, 31 and 47%, respectively within 96h. Heavy metals such as arsenic, cadmium, chromium and lead were also removed up to 28-77% after phytoremediation...
May 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28528474/toxicity-assessment-of-ash-and-dust-from-handmade-gold-jewelry-manufacturing-workshops-in-bangladesh
#3
Arif M Sikder, Tanvir Hossain, Manzurul H Khan, M Aziz Hasan, M Fakhruzzaman, Joseph B Turner, Dmitry Pestov, Leigh S McCallister, K Maudood Elahi
Traditionally, handmade gold jewelry played a very important role in the cultural heritage of Bangladesh. Goldsmiths still are partially using ancient manufacturing process with coal fire, candle flame blowing, and nitric and sulfuric acid treatments. Such process leads to the contamination of workplace with the dust of toxic metals, acidic vapors, and particles of different natures. To evaluate contamination by particulate matter (PM), the passive particle collectors were installed in different manufacturing units for a period of 85 days at Tanti Bazar, Dhaka, Bangladesh...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28528260/hexavalent-chromium-induced-oxidative-stress-and-apoptosis-in-pycnoporus-sanguineus
#4
Mi Feng, Hua Yin, Hui Peng, Zehua Liu, Guining Lu, Zhi Dang
White rot fungi have been proved to be a promising option for the removal of heavy metals, understanding their toxic response to heavy metals is conducive to developing and popularizing fungi-based remediation technologies so as to lessen the hazard of heavy metals. In this study, Cr(VI)-induced oxidative stress and apoptosis in Pycnoporus sanguineus, a species of white rot fungi were investigated. The results suggested that high level of Cr(VI) promoted the formation of ROS, including H2O2, O2(•-) and ·OH...
May 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28527339/selective-removal-of-toxic-cr-vi-from-aqueous-solution-by-adsorption-combined-with-reduction-at-a-magnetic-nanocomposite-surface
#5
Nazia H Kera, Madhumita Bhaumik, Kriveshini Pillay, Suprakas Sinha Ray, Arjun Maity
The adsorption of toxic hexavalent chromium (Cr(VI)) and its reduction to trivalent chromium (Cr(III)) are important processes for the treatment of industrial wastewater. Conducting polymers can adsorb and reduce Cr(VI) to less toxic Cr(III) but have low adsorption capacities due to agglomeration of particles and are difficult to separate from treated water. In this study, magnetic polypyrrole (PPy)-polyaniline (PANI)/iron oxide (Fe3O4) nanocomposite was synthesized for the selective removal of Cr(VI) in aqueous solution...
May 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28506761/the-decline-in-kidney-function-with-chromium-exposure-is-exacerbated-with-co-exposure-to-lead-and-cadmium
#6
Tsung-Lin Tsai, Chin-Chi Kuo, Wen-Harn Pan, Yu-Teh Chung, Chiu-Ying Chen, Trong-Neng Wu, Shu-Li Wang
Environmental factors contribute significantly to the pathogenesis of chronic kidney disease. However, these factors, and particularly the toxic effects of heavy metals, have not been completely evaluated. Chromium is a widespread industrial contaminant that has been linked to nephrotoxicity in animal and occupational population studies. Nevertheless, its role in population renal health and its potential interactions with other nephrotoxic metals, such as lead and cadmium, remain unknown. We assessed the association between exposure to chromium, lead, and cadmium with renal function using estimated glomerular filtration rate (eGFR) in an analysis of 360 Taiwanese adults aged 19-84 years from the National Nutrition and Health Survey in Taiwan (2005-2008)...
May 12, 2017: Kidney International
https://www.readbyqxmd.com/read/28503260/dynamics-of-hexavalent-chromium-in-four-types-of-aquaculture-ponds-and-its-effects-on-the-morphology-and-behavior-of-cultured-clarias-gariepinus-burchell-1822
#7
Moshood Keke Mustapha
Hexavalent chromium is a bio accumulative toxic metal in water and fish. It enters aquaculture ponds mainly through anthropogenic sources. Hexavalent chromium concentrations and its effects on the morphology and behavior of Clarias gariepinus were investigated from four aquaculture ponds for 12 weeks. Chromium was measured using diphenyl carbohdrazide method; alkalinity and hardness were measured using colometric method and analyzed with Bench Photometer. Temperature and pH were measured using pH/EC/TDS/Temp combined tester...
April 2017: Toxicological Research
https://www.readbyqxmd.com/read/28502229/hexavalent-chromium-induces-reactive-oxygen-species-and-impairs-the-antioxidant-power-of-human-erythrocytes-and-lymphocytes-decreased-metal-reducing-and-free-radical-quenching-ability-of-the-cells
#8
Nazim Husain, Riaz Mahmood
The toxicity of hexavalent chromium [Cr(VI)] in biological systems is thought to be closely associated with the generation of free radicals and reactive oxygen species. These species are produced when Cr(VI) is reduced to its trivalent form in the cell. This process results in oxidative stress due to an imbalance between the detoxifying ability of the cell and the production of free radicals. We have studied the effect of potassium dichromate (K2Cr2O7), a [Cr(VI)] compound, on the antioxidant power of human erythrocytes and lymphocytes under in vitro conditions...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28501334/exchangeable-sodium-percentage-decrease-in-saline-sodic-soil-after-basic-oxygen-furnace-slag-application-in-a-lysimeter-trial
#9
Chiara Pistocchi, Giorgio Ragaglini, Valentina Colla, Teresa Annunziata Branca, Cristiano Tozzini, Lea Romaniello
The Basic Oxygen Furnace Slag results from the conversion of hot metal into steel. Some properties of this slag, such as the high pH or calcium and magnesium content, makes it suitable for agricultural use as a soil amendment. Slag application to agricultural soils is allowed in some European countries, but to date there is no common regulation in the European Union. In Italy soils in coastal areas are often affected by excess sodium, which has several detrimental effects on the soil structure and crop production...
May 10, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28501168/high-sensitivity-thermal-lens-microscopy-cr-vi-trace-detection-in-water
#10
E Cedeño, H Cabrera, A E Delgadillo-López, O Delgado-Vasallo, A M Mansanares, A Calderón, E Marín
In this work, a low detection limit for hexavalent chromium in water of parts per trillions (21ng/L) was achieved using a micro-spatial thermal lens spectroscopy setup with coaxial counter-propagating pump and probe laser beams and an integrated passive optical Fabry-Perot resonator, aided with a well-established diphenyl carbazide colorimetric method. Cr-VI concentrations in the range of μg/L, i.e. well-below the toxicity thresholds in humans and animals (26 and 190mg/L respectively) and below those delimited by international regulations for drink water (~0...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28493716/bifenthrin-causes-toxicity-in-urban-stormwater-wetlands-field-and-laboratory-assessment-using-austrochiltonia-amphipoda
#11
Katherine Joanna Jeppe, Claudette Robin Kellar, Stephen Marshall, Valentina Colombo, Georgia May Sinclair, Vincent J Pettigrove
Stormwater wetlands are engineered to accumulate sediment and pollutants from stormwater and provide environmental value to urban environments. Therefore, contaminated sediment risks causing toxicity to aquatic fauna. This research identifies contaminants of concern in urban wetland sediments by assessing sediment toxicity using the amphipod Austrochiltonia subtenuis. Sediments from 99 wetlands were analyzed for contaminants and laboratory bioassays were performed with A. subtenuis. Wild Austrochiltonia spp...
May 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28486155/determination-of-chromium-vi-in-primary-and-secondary-fertilizer-and-their-respective-precursors
#12
Oliver Krüger, Francesca Fiedler, Christian Adam, Christian Vogel, Rainer Senz
Hexavalent chromium species (Cr(VI)) are often carcinogenic, of high acute toxicity, highly mobile, and thus pose a severe risk to health and environment. Fertilizers usually contain significant amounts of chromium. Therefore, a reliable analysis of chromium and the fraction of Cr(VI) are crucial for safe use of fertilizers. This problem is expected to increase in the future, since more and more recycled fertilizers emerge due to increasing fertilizer demand and respective supply risks. However, existing analytical methods have been developed for conventional fertilizers and have to be tested whether they are suitable for the new materials...
May 2, 2017: Chemosphere
https://www.readbyqxmd.com/read/28476960/synthetically-modified-nano-cellulose-for-the-removal-of-chromium-a-green-nanotech-perspective
#13
Priyanka Jain, Shilpa Varshney, Shalini Srivastava
Existing processes for the decontamination of heavy metals from water are found to be cost-prohibitive and energy-intensive which is totally against the sustainable concept of development. Green nanotechnology for water purification for ecosystem management, agricultural and industry is an emerging as leading global priority and occupies better position over the current state of water purification. Herein, the diafunctionalised polyaniline modified nanocellulose composite sorbent (PANI-NCC) has been used to introduce amine and imine functionalities for the removal of trivalent and hexavalent chromium from water bodies...
February 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28472707/a-novel-two-phase-bioreactor-for-microbial-hexavalent-chromium-removal-from-wastewater
#14
G Lytras, C Lytras, D Argyropoulou, N Dimopoulos, G Malavetas, G Lyberatos
Α novel two-phase bioreactor for the microbial removal of Cr(VI) from wastewater with high chromium concentration (up to 1350ppm) is developed. Among several potential solid-phase adsorbents tested, Cloisite(®) 30B, a natural montmorillonite modified with a quaternary ammonium salt that absorbs Cr(VI) in a reversible manner proved to be optimal as the solid phase of the bioreactor. Cloisite(®) 30B has no toxicity to the acclimated biomass and keeps the concentration of Cr(VI) ions at sub-inhibitory levels that ensure the efficient microbial removal of Cr(VI)...
April 23, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28472532/high-throughput-screening-data-interpretation-in-the-context-of-in-vivo-transcriptomic-responses-to-oral-cr-vi-exposure
#15
Julia E Rager, Caroline L Ring, Rebecca C Fry, Mina Suh, Deborah M Proctor, Laurie C Haws, Mark A Harris, Chad M Thompson
The toxicity of hexavalent chromium [Cr(VI)] in drinking water has been studied extensively, and available in vivo and in vitro studies provide a robust dataset for application of advanced toxicological tools to inform the mode of action (MOA). This study aimed to contribute to the understanding of Cr(VI) MOA by evaluating high-throughput screening (HTS) data and other in vitro data relevant to Cr(VI), and comparing these findings to robust in vivo data, including transcriptomic profiles in target tissues. Evaluation of Tox21 HTS data for Cr(VI) identified 11 active assay endpoints relevant to the Ten Key Characteristics of Carcinogens (TKCCs) that have been proposed by other investigators...
May 2, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28463793/caffeic-acid-phenethyl-ester-protects-the-brain-against-hexavalent-chromium-toxicity-by-enhancing-endogenous-antioxidants-and-modulating-the-jak-stat-signaling-pathway
#16
Ayman M Mahmoud, Sanaa M Abd El-Twab
Hexavalent chromium [Cr(VI)] is commonly used in industry, and is a proven toxin and carcinogen. However, the information regarding its neurotoxic mechanism is not completely understood. The present study was designed to scrutinize the possible protective effects of caffeic acid phenethyl ester (CAPE), a bioactive phenolic of propolis extract, on Cr(VI)-induced brain injury in rats, with an emphasis on the JAK/STAT signaling pathway. Rats received 2mg/kgK2CrO4 and concurrently treated with 20mg/kg CAPE for 30 days...
April 29, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28460294/integral-use-of-sugarcane-vinasse-for-biomass-production-of-actinobacteria-potential-application-in-soil-remediation
#17
Juan D Aparicio, Claudia S Benimeli, César A Almeida, Marta A Polti, Verónica L Colin
The use of living actinobacteria biomass to clean up contaminated soils is an attractive biotechnology approach. However, biomass generation from cheap feedstock is the first step to ensure process sustainability. The present work reports the ability of four actinobacteria, Streptomyces sp. M7, MC1, A5, and Amycolatopsis tucumanensis, to generate biomass from sugarcane vinasse. Optimal vinasse concentration to obtain the required biomass (more than 0.4 g L(-1)) was 20% for all strains, either grown individually or as mixed cultures...
April 23, 2017: Chemosphere
https://www.readbyqxmd.com/read/28448111/stepwise-deprotonation-of-magnetite-supported-gallic-acid-modulates-oxidation-state-and-adsorption-assisted-translocation-of-hexavalent-chromium
#18
Xiaoyu Guan, Yi Chen, Haojun Fan
Recently, a synergistic strategy involving reduction of carcinogenic Cr(VI) into less toxic Cr(III) followed by Cr(III) adsorption and subsequent separation by surface-engineered magnetite nanoparticles has emerged as a promising alternative to address the environmental hazards associated with Cr(VI)-contaminated water. Despite several previous attempts exploiting this synergy, modulating the oxidation state and translocation of Cr(VI) with high spatiotemporal precision remains a major challenge. Here, we report how Cr(VI) responds accordingly in a well-defined manner to deprotonation of gallic acid covalently immobilized on magnetite nanoparticles, which proceeds through a fixed spatial sequence of distinct stages...
April 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28448110/heavy-metals-induce-decline-of-derivatives-of-5-methycytosine-in-both-dna-and-rna-of-stem-cells
#19
Jun Xiong, Xiaona Liu, Qing-Yun Cheng, Shan Xiao, Lai-Xin Xia, Bi-Feng Yuan, Yu-Qi Feng
Toxic heavy metals have been considered to be harmful environmental contaminations. The molecular mechanisms of heavy-metals-induced cytotoxicity and carcinogenicity are still not well elucidated. Previous reports showed exposures to toxic heavy metals can cause a change of DNA cytosine methylation (5-methylcytosine, 5-mC). However, it is still not clear whether heavy metals have effects on the recently identified new epigenetic marks in both DNA and RNA, i.e., 5-hydroxymethylcytosine (5-hmC), 5-formylcytosine (5-foC), and 5-carboxylcytosine (5-caC)...
May 3, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28446841/occupation-related-chromium-toxicity-a-rare-cause-of-renal-failure-and-rhabdomyolysis
#20
Manjeera Jagannati, I Ramya, Sowmya Sathyendra
A 21-year-old gentleman, a worker in a mobile phone shop, was admitted with rhabdomyolysis, renal failure, and pulmonary edema requiring mechanical ventilation and hemodialysis. After extensive workup and ruling out other causes, heavy metal poisoning was considered. Investigations during the course of the hospital stay revealed chromium poisoning. With repeated hemodialysis, his parameters normalized and he was discharged home in a stable condition. Diagnosis of chromium toxicity needs high index of suspicion...
September 2016: Indian Journal of Occupational and Environmental Medicine
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